No I just pick the paint out of the book (can't do metalflake) they mix it up, add the reducer and hardener, then can it. Then they mix up the clear and put it in a different can.
Only downside is you have about a day to use it or it goes bad and your limited on paint.
I done my bellypan, and front fender,after I gouged it, this way almost two years ago and it's holding up great. I have also spot patched my truck as well.
Here is a couple of pictures of the motorcycle right after I done it, and a current shot. It was ment to be a temp fix, but it sti3l looks good so I haven't messed with it.